Polarity and selectivity acc. Snyder

Solvents ordered according to Snyder's P' (polarity index). The selectivities are based on the gas-liquid equilibrium of three probe molecules; ethanol (x_e), 1,4-dioxane (x_d) and nitromethane (x_n).

Snyder, LR; 'Classification of the Solvent Properties of Common Liquids', J. Chromatography, 92 (1978) 223-234.

P':	Polarity index
xe:	Solvent selectivity parameter: hydrogen bond basicity
xd:	Solvent selectivity parameter: hydrogen bond acidity
xn:	Solvent selectivity parameter: dipole - dipole interaction

Least polar
Name	Structure	P'	xe	xd	xn
cyclopentane		0	0	0	0
1,1,2-trichloro-1,2,2-trifluoroethane		0	0	0	0
pentane		0	0	0	0
cyclohexane		0.1	0	0	0
heptane		0.1	0	0	0
2,2,4-trimethylpentane		0.1	0	0	0
hexane		0.1	0	0	0
carbon disulfide		0.3	-	-	-
decane		0.4	-	-	-
1-chlorobutane		1	-	-	-
tetrachloromethane		1.6	0.26	0.4	0.34
triethylamine		1.9	-	-	-
dibutyl ether		2.1	0.44	0.18	0.38
diisopropyl ether		2.4	0.48	0.14	0.38
toluene		2.4	0.25	0.28	0.47
1,4-dimethylbenzene		2.5	-	-	-
1,2-dimethylbenzene		2.5	-	-	-
2-methoxy-2-methylpropane		2.5	-	-	-
benzene		2.7	0.23	0.32	0.45
chlorobenzene		2.7	0.23	0.33	0.44
bromobenzene		2.7	-	-	-
1,2-dichlorobenzene		2.7	-	-	-
diethyl ether		2.8	0.53	0.13	0.34
dichloromethane		3.1	0.27	0.33	0.4
fluorobenzene		3.2	-	-	-
octanol		3.4	0.56	0.18	0.25
1,2-dichloroethane		3.5	0.3	0.21	0.49
1,1-dichloroethane		3.5	0.3	0.21	0.49
3-methyl-1-butanol		3.7	0.56	0.19	0.26
methoxybenzene		3.8	0.27	0.29	0.43
2-propanol		3.9	0.55	0.19	0.27
butanol		3.9	0.59	0.19	0.25
5-methyl-2-hexanone		4	-	-	-
propanol		4	0.54	0.19	0.27
butyl acetate		4	-	-	-
2-methyl-1-propanol		4	-	-	-
tetrahydrofuran		4	0.38	0.2	0.42
trichloromethane		4.1	0.31	0.35	0.34
2-methyl-2-propanol		4.1	0.56	0.2	0.24
4-methyl-2-pentanone		4.2	-	-	-
ethanol		4.3	0.52	0.19	0.29
nitrobenzene		4.4	0.26	0.3	0.44
ethyl acetate		4.4	0.34	0.23	0.43
2-pentanone		4.5	-	-	-
2-butanone		4.7	0.35	0.22	0.43
dioxane		4.8	0.36	0.24	0.4
methanol		5.1	0.48	0.22	0.31
2-propanone		5.1	0.35	0.23	0.42
pyridine		5.3	0.42	0.22	0.36
2-methoxyethanol		5.5	0.38	0.24	0.38
benzyl alcohol		5.7	0.4	0.29	0.31
acetonitrile		5.8	0.31	0.27	0.42
nitromethane		6	0.28	0.31	0.4
acetic acid		6	0.39	0.31	0.3
4-methyl-2-oxo-1,3-dioxolane		6.1	-	-	-
aniline		6.3	0.32	0.32	0.36
N,N-dimethylformamide		6.4	0.39	0.21	0.4
N,N-dimethylacetamide		6.5	0.38	0.2	0.41
oxolan-2-one		6.5	-	-	-
N-methylpyrrolidone		6.7	-	-	-
ethanediol		6.9	0.43	0.29	0.28
dimethyl sulfoxide		7.2	0.39	0.23	0.39
dodecafluoroheptanol		8.8	0.33	0.4	0.27
formamide		9.6	0.37	0.33	0.3
water		10.2	0.37	0.37	0.25
Most polar